Fix integer overflow in ComputedStyle::computedLineHeight

Source/core/style/ComputedStyle.cpp

Index: Source/core/style/ComputedStyle.cpp
diff --git a/Source/core/style/ComputedStyle.cpp b/Source/core/style/ComputedStyle.cpp
index be6750a2d58f368f365364f44fa3add27163e796..badd02cfba34eab146e418c9946673376952088c 100644
--- a/Source/core/style/ComputedStyle.cpp
+++ b/Source/core/style/ComputedStyle.cpp
@@ -1256,7 +1256,7 @@ int ComputedStyle::computedLineHeight() const
     if (lh.isPercent())
         return minimumValueForLength(lh, fontSize());
 
-    return lh.value();
+    return LayoutUnit(lh.value());

[leviw_travelin_and_unemployed, 2015/04/09 23:29:16]

I'd just use max(lh.value(), LayoutUnit::max()). That's clearer about what
you're trying to do I think.

 }
 
 void ComputedStyle::setWordSpacing(float wordSpacing)